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Useful for:
* users learning xarray
* building tutorials in the documentation.
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Load a dataset from the online repository (requires internet).
If a local copy is found then always use that to avoid network traffic.
Parameters
----------
name : str
Name of the netcdf file containing the dataset
ie. 'air_temperature'
cache_dir : string, optional
The directory in which to search for and write cached data.
cache : boolean, optional
If True, then cache data locally for use on subsequent calls
github_url : string
Github repository where the data is stored
kws : dict, optional
Passed to xarray.open_dataset
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